Modes computation and analysis for long multi-span bundle conductors of power transmission lines with galloping control devices |
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Authors: | Zhao Gaoyu and He Zeng |
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Institution: | (1) Department of Engineering Mechanics, Huazhong University of Science and Technology, 430074 Wuhan, China |
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Abstract: | A new type of element which is suitable for solving the modes of the galloping long multi-span bundle conductor structures
is presented. The element is composed of all sub-conductor segments between two spacers. Based on the linearized governing
differential equations of the conductors, the mass matrix and stiffness matrix of the element in consideration of the constrained
relations imposed on the conductors by spacers are derived. The dynamic characteristics of the galloping control devices can
be directly added to the element. The modes for an actual power line structure are computed by using the element formula and
FEM procedures, where seven cases of different galloping control device allocations are considered. Compared with the measured
data, the method is shown to be reliable and effective. Analysis and discussions of the computational results are given. Some
hints that are helpful to further investigation of galloping are also obtained. |
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Keywords: | bundle conductors galloping control devices finite element method modes of free vibration |
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